made htmlplugin.rb ruby 1.9 compatible
fixed a bug in BlockParser#add_verbatim_block that doesn't throw away a VERBATIM_END line
changed the timing of parsing inline elements in ParagraphNode, and now parses multiple leafs at one time
introduced NonNestedBlockLeaf and NonNestedBlockNode
implemented QuoteNode#parse_leafs
tidy up BlockLeaf.create and NonNestedBlockNode#parse_leafs
moved the main part of NonNestedBlockNode#parse_leafs to BlockLeaf#parse_leafs
the notation for verbatim blocks may be usable now
supported the automatical link generation for urls, except for verbatim blocks
fixed the bug of the previous commit
supported the automatical link generation for urls in verbatim blocks